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首页> 外文期刊>Journal of Heat Transfer >Roles of Nanofluids, Temperature of Base Fluids, and Pressure Gradient on Heat Transfer Enhancement From a Cylinder: Uniformly Heated/Heat Flux
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Roles of Nanofluids, Temperature of Base Fluids, and Pressure Gradient on Heat Transfer Enhancement From a Cylinder: Uniformly Heated/Heat Flux

机译：纳米流体，基础流体温度和压力梯度对圆柱体传热增强的作用：均匀加热/热通量

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摘要

Heat transfer from a cylinder of square cross section (either dissipating constant heat flux (qW) or maintaining at a constant temperature (T-W)) placed near a plane wall under the incidence of nonuniform linearonlinear velocity profile is studied numerically (finite volume method (FVM), quadratic upstream interpolation for convective kinematics (QUICK), and SIMPLE). The conventional fluids are chosen as water, and ethylene glycol-water mixture. The nanoparticles are selected as Al2O3 and CuO. Roles of pressure gradient P (at the inlet), temperature of base fluids, thermal conditions (T-W or q(W)), and nanofluids' parameters (nanoparticle concentrations (phi), diameter, materials, and base fluids) on the heat transfer (Nusselt number (Nu(M))) of the cylinder are investigated here. Nu(M) enhancement from the cylinder together with its drag coefficient reduction/ increment due to addition of nanomaterials in both fluids at two different temperatures is assessed under the Couette flow. Classical fluid dynamics relationship among NuM, Reynolds number (Re), and Prandtl number is discussed through Colburn j-factor, and hence the utility of proposed correlation between j-factor and Re toward engineering problems is also explored. The graphical observations of dependency of Nu(M) on the aforesaid parameters are reconfirmed by proposed functional forms of Nu(M) = Nu(M)(P); Nu(M) = Nu(M) (phi) and hence Nu(M) = Nu(M) (P, phi) An effort is made to examine the effectiveness of the aforementioned parameters on the heat transfer enhancement rate.
机译：数值研究了在线性/非线性速度分布不均匀的情况下放置在平面壁附近的方形截面圆柱的热传递（消散恒定热通量（qW）或保持恒定温度（TW）） （FVM），对流运动学的二次上游插值（QUICK）和SIMPLE）。选择常规流体作为水和乙二醇-水的混合物。选择纳米颗粒为Al 2 O 3和CuO。压力梯度P（在入口处），基础流体的温度，热条件（TW或q（W））以及纳米流体的参数（纳米粒子浓度（phi），直径，材料和基础流体）在传热中的作用在此研究圆柱体的（努塞尔数（Nu（M）））。在库埃特流量下评估了在两个不同温度下两种流体中添加纳米材料导致的缸中Nu（M）增强及其阻力系数减小/增加。通过Colburn j因子讨论了NuM，Reynolds数（Re）和Prandtl数之间的经典流体动力学关系，因此也探索了j因子与Re之间的相关性对工程问题的实用性。通过提议的Nu（M）= Nu（M）（P）的函数形式再次证实了Nu（M）对上述参数的依赖性的图形观察。 Nu（M）＝ Nu（M）（phi），因此Nu（M）＝ Nu（M）（P，phi）努力检查上述参数对传热增强率的有效性。

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